Nicki Minaj's rant on the set of ' American Idol' made headlines this past fall, and Wednesday night's broadcast from the Charlotte, N.C., auditions revealed what got the rapper so upset - a debate over country music.

It all started as the judges were listening to "Idol" hopeful Summer Cunningham try out with Bill Withers' "Lean On Me." All the judges liked the performance, with Randy Jackson telling her that she should sing country.

Cunningham responded that she'd "tried the country thing" and was now trying to go for more of a R&B sound.

Country star Keith Urban said he didn't know what to make of Cunningham's statement about trying out country, while fellow judge Mariah Carey told Summer she also had a good voice for country.

Minaj clearly didn't like all the debate. She accused Jackson and Carey of trying to pigeonhole the singers into specific genres. That's when everyone on the panel started talking over each other and defending their positions.

Finally, Urban cut in and confirmed that Cunningham was going to Hollywood. But the argument was far from over.

After Jackson brought up his 30 years experience in the music industry, Minaj took offense and said, "I'm sorry. I can't help her. Let me get off the f***ing panel." She then walked off the set.

The leaked footage of Minaj's full-on meltdown that set the Internet on fire this past summer was not shown on Wednesday night's show, however.

On video obtained by TMZ.com, Minaj was caught lobbing F-bombs at pop diva Carey, 42, referring to her at one point as "her f***ing highness."

After the cameras were off, Carey claims others heard Minaj take it even further and say, "If I had a gun, I would shoot that bitch," as Barbara Walters reported on "The View."

In January, Carey told Walters, "It felt like an unsafe work environment. Anytime anybody's reeling threats at somebody, you know, it's not appropriate. I'm a professional. I'm not used to that type of environment."

As a result, Carey said she hired more security. Minaj has denied saying anything about a gun, calling the statement a "fabrication." When ABC News asked her for comment for this story, her representative said "she's said what she's saying on this topic."